html,
body {
    margin: 0;
    padding: 0;
}

body {
    padding: 15px;
    background-color: #f2f3f5;
}

#parent_btn {
    display: flex;
    justify-content: flex-end;
}

.edit {
    position: relative;
}

/*.edit_mask{*/
/*    display: block;*/
/*    position: absolute;*/
/*    top:0;*/
/*    left: 0;*/
/*    width: 100%;*/
/*    height: 100%;*/
/*    background: rgba(0,0,0,0);*/
/*    z-index: 999;*/
/*}*/

.edit::before{
    content: '';
    position: absolute;
    display: block;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0);
    /*至于最顶层*/
    z-index: 2;
}

#img{
    border-width: 1px;
    border-style: solid;
    border-color: #e6e6e6;
}